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the orientation=”global” doesn’t matter in this case, because the 2D image is always drawn on the 3D space on to the screen plane perpendicular to the user view.
In this simple case the picture doesn’t use any value of the condition, all conditions of this name will be represented with the same bitmap.
Procedural drawing
It is also possible to draw 3D symbols using OpenGL commands to draw triangles, lines, etc.
A simple way is to have the shape defined stored in a file with GiD mesh ASCII format
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